<template>
  <div class="article-container">
    <!-- 导航栏 -->
    <van-nav-bar
      class="page-nav-bar"
      left-arrow
      title="黑马头条"
      @click-left="$router.back()"
    ></van-nav-bar>

    <!-- /导航栏 -->

    <div class="main-wrap">
      <!-- 加载中 -->
      <div class="loading-wrap" v-if="loading">
        <van-loading color="#3296fa" vertical>加载中</van-loading>
      </div>
      <!-- /加载中 -->
      <template v-else>
        <!-- 加载完成-文章详情 -->
        <div class="article-detail" v-if="errorCode === 1">
          <!-- 文章标题 -->
          <h1 class="article-title">{{ article.title }}</h1>
          <!-- /文章标题 -->

          <!-- 用户信息 -->
          <van-cell class="user-info" center :border="false">
            <van-image
              class="avatar"
              slot="icon"
              round
              fit="cover"
              :src="article.aut_photo"
            />
            <div slot="title" class="user-name">{{ article.aut_name }}</div>
            <div slot="label" class="publish-date">
              {{ article.pubdate | relativeTime }}
            </div>
            <!-- 关注按钮组件 -->
            <follow-user
              :is_followed.sync="article.is_followed"
              :user-id="article.aut_id"
              class="follow-btn"
            />
          </van-cell>
          <!-- /用户信息 -->

          <!-- 文章内容 -->
          <div
            class="article-content markdown-body"
            v-html="article.content"
            ref="content"
          ></div>
          <van-divider>正文结束</van-divider>

          <!-- 评论列表 -->
          <comment-list
            :source-id="article.art_id"
            @update-count="totalCount = $event"
            :list="comment_list"
            @click_reply="onClickReply"
          />
          <!-- /评论列表 -->

          <!-- 评论回复弹框 -->
          <van-popup
            v-model="isReplyShow"
            position="bottom"
            style="height:100%"
          >
            <comment-reply
              v-if="isReplyShow"
              @click-close="isReplyShow = false"
              :current-comment="currentComment"
              :article-id="article.art_id"
            />
          </van-popup>
          <!-- /评论回复弹框 -->
        </div>
        <!-- /加载完成-文章详情 -->

        <!-- 加载失败：404 -->
        <div class="error-wrap" v-if="errorCode === 2">
          <van-icon name="failure" />
          <p class="text">该资源不存在或已删除！</p>
        </div>
        <!-- /加载失败：404 -->

        <!-- 加载失败：其它未知错误（例如网络原因或服务端异常） -->
        <div class="error-wrap" v-if="errorCode === 3">
          <van-icon name="failure" />
          <p class="text">内容加载失败！</p>
          <van-button class="retry-btn" @click="loadArticle"
            >点击重试</van-button
          >
        </div>
        <!-- /加载失败：其它未知错误（例如网络原因或服务端异常） -->
        <!-- 底部区域 -->
        <div class="article-bottom">
          <van-button
            class="comment-btn"
            type="default"
            round
            size="small"
            @click="isPostShow = true"
            >写评论</van-button
          >
          <!-- 评论弹框 -->
          <van-popup v-model="isPostShow" position="bottom">
            <comment-post
              v-if="isPostShow"
              :target="article.art_id"
              :list="comment_list"
              @close="isPostShow = false"
              @update-count="totalCount++"
            />
          </van-popup>

          <van-icon name="comment-o" :badge="totalCount" color="#777" />
          <!-- 收藏组件 -->
          <!-- <van-icon color="#777" name="star-o" /> -->
          <article-collect
            v-model="article.is_collected"
            :art-id="article.art_id"
          />
          <!-- 点赞组件 -->
          <article-attitude
            :art-id="article.art_id"
            :is_like.sync="article.attitude"
          />

          <van-icon name="share" color="#777777"></van-icon>
        </div>
        <!-- /底部区域 -->
      </template>
    </div>
  </div>
</template>
<script>
import { getArticleById } from "@/api/article";

import followUser from "@/components/follow-user";
import articleCollect from "@/components/article-collect";
import articleAttitude from "@/components/article-attitude";
import commentList from "./components/comment-list";
import "./github-markdown.css";
import { ImagePreview } from "vant";
import CommentPost from "./components/comment-post.vue";
import CommentReply from "./components/comment-reply.vue";
export default {
  name: "Article",
  components: {
    followUser,
    articleCollect,
    articleAttitude,
    commentList,
    CommentPost,
    CommentReply
  },

  data() {
    return {
      article: {},
      loading: false,
      errorCode: 1,
      isFollowLoading: false,
      totalCount: "",
      isPostShow: false,
      comment_list: [],
      isReplyShow: false,
      currentComment: {}
    };
  },
  props: {
    articleId: {
      type: [Number, String, Object],
      required: true
    }
  },
  methods: {
    async loadArticle() {
      this.loading = true;
      try {
        let { data: res } = await getArticleById(this.articleId);
        console.log(res);
        this.article = res.data;
        this.loading = false;
        this.errorCode = 1;
        // 等到dom渲染完成之后再获取元素
        this.$nextTick(() => {
          let imgList = this.$refs.content.querySelectorAll("img");
          let img_arr = [];
          imgList.forEach(item => {
            img_arr.push(item.src);
          });
          imgList.forEach((item, index) => {
            item.onclick = () => {
              ImagePreview({
                images: img_arr,
                startPosition: index
              });
            };
          });
        });
      } catch (error) {
        if (error.response.status == 404) {
          this.errorCode = 2;
        } else {
          this.errorCode = 3;
        }
        this.loading = false;
      }
    },
    onClickReply(val) {
      this.isReplyShow = true;
      this.currentComment = val;
    }
  },
  created() {
    this.loadArticle();
  }
};
</script>
<style lang="less" scoped>
.article-container {
  .main-wrap {
    position: fixed;
    left: 0;
    right: 0;
    top: 92px;
    bottom: 88px;
    overflow-y: scroll;
    background-color: #fff;
    z-index: 2;
  }
  .article-detail {
    .article-title {
      font-size: 40px;
      padding: 50px 32px;
      margin: 0;
      color: #3a3a3a;
    }

    .user-info {
      padding: 0 32px;
      .avatar {
        width: 70px;
        height: 70px;
        margin-right: 17px;
      }
      .van-cell__label {
        margin-top: 0;
      }
      .user-name {
        font-size: 24px;
        color: #3a3a3a;
      }
      .publish-date {
        font-size: 23px;
        color: #b7b7b7;
      }
      .follow-btn {
        width: 170px;
        height: 58px;
      }
    }

    .article-content {
      padding: 55px 32px;
      /deep/ p {
        text-align: justify;
      }
    }
  }

  .loading-wrap {
    padding: 200px 32px;
    display: flex;
    align-items: center;
    justify-content: center;
    background-color: #fff;
  }

  .error-wrap {
    padding: 200px 32px;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    background-color: #fff;
    .van-icon {
      font-size: 122px;
      color: #b4b4b4;
    }
    .text {
      font-size: 30px;
      color: #666666;
      margin: 33px 0 46px;
    }
    .retry-btn {
      width: 280px;
      height: 70px;
      line-height: 70px;
      border: 1px solid #c3c3c3;
      font-size: 30px;
      color: #666666;
    }
  }

  .article-bottom {
    position: fixed;
    left: 0;
    right: 0;
    bottom: 0;
    display: flex;
    justify-content: space-around;
    align-items: center;
    box-sizing: border-box;
    height: 88px;
    border-top: 1px solid #d8d8d8;
    background-color: #fff;
    .comment-btn {
      width: 282px;
      height: 46px;
      border: 2px solid #eeeeee;
      font-size: 30px;
      line-height: 46px;
      color: #a7a7a7;
    }
    .van-icon {
      font-size: 40px;
      .van-info {
        font-size: 16px;
        background-color: #e22829;
      }
    }
  }
}
</style>
